All data are in degrees Fahrenheit

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Water temperature in Holyhead

Detailed information about the current water temperature in Holyhead. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.
Sea temperature in Holyhead now

59.6

°F

June 29, 18:30

Trend:

increasing

Yesterday:

59.2°F

Tomorrow:

59.7°F

Sunrise:

04:54

Sunset:

21:50

Day Length:

16 h. 56 min.

Holyhead in July

Minimum:

47.0°F

Average:

48.8°F

Maximum:

50.3°F

Sea water temperature in Holyhead today

As of now, in Holyhead, the water temperature is 59.6°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 2.8°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to stay about the same.

Recent sea temperature and forecast

Today's water temperature is notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 58.9°F on 2023, while the historical minimum was 55.4°F on 2016.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 60.0°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Holyhead

Date Current Year

actual* / forecast**

last year 10 years average
Jun 15 55.6°F 55.9°F 55.1°F
Jun 16 55.9°F 56.8°F 55.5°F
Jun 17 55.8°F 56.3°F 55.5°F
Jun 18 56.6°F 57.0°F 55.7°F
Jun 19 55.7°F 57.4°F 55.7°F
Jun 20 56.2°F 56.9°F 55.8°F
Jun 21 57.0°F 57.5°F 56.2°F
Jun 22 56.5°F 57.6°F 56.3°F
Jun 23 57.7°F 57.9°F 56.5°F
Jun 24 58.2°F 57.6°F 56.5°F
Jun 25 58.6°F 57.9°F 56.8°F
Jun 26 59.4°F 57.7°F 56.8°F
Jun 27 59.2°F 58.0°F 57.0°F
Jun 28 59.2°F 57.9°F 57.2°F
Jun 29 59.6°F 58.4°F 56.8°F
Jun 30 59.7°F 58.5°F 56.9°F
Jul 1 59.6°F 58.0°F 56.8°F
Jul 2 59.8°F 58.3°F 57.1°F
Jul 3 60.2°F 58.6°F 57.4°F
Jul 4 60.2°F 58.4°F 57.4°F
Jul 5 60.1°F 58.5°F 57.3°F
Jul 6 60.2°F 58.8°F 57.5°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Holyhead by month

In an average year, Holyhead offers no days when the water temperature is warm enough to swim comfortably.
The warmest water in Holyhead was recorded on August 29, 2025, reaching a 63.3°F. While the coldest temperature occurred on March 9, 2018, dipping to 43.0°F. The average readings by season are 48.5°F in Winter, 48.7°F in Spring, 58.2°F in Summer, and 57.9°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Caernarfon 63.2°F 19mi
Bangor 64.3°F 21mi
Conwy 63.8°F 33mi
Douglas 57.8°F 59mi
Aberystwyth 65.0°F 66mi

* current water temperature in this city

** straight line distance from Holyhead